<template>
  <teleport to="body">
    <transition name="slide">
      <div class="add-song" v-show="visible">
        <div class="header">
          <h1 class="title">添加歌曲到列表</h1>
          <div class="close" @click="hide">
            <i class="icon-close"></i>
          </div>
        </div>
        <div class="search-input-wrapper">
          <search-input v-model="query" placeholder="搜索歌曲"></search-input>
        </div>
        <div v-show="!query">
          <switches
            :items="['最近播放', '搜索历史']"
            v-model="currentIndex"
          ></switches>
          <div class="list-wrapper">
            <scroll
              v-if="currentIndex === 0"
              class="list-scroll"
              ref="scrollRef"
            >
              <div class="list-inner">
                <song-list
                  :songs="playHistory"
                  @select="selectSongBySongList"
                ></song-list>
              </div>
            </scroll>
            <scroll
              v-if="currentIndex === 1"
              class="list-scroll"
              ref="scrollRef"
            >
              <div class="list-inner">
                <search-list
                  :searches="searchHistory"
                  :showDelete="false"
                  @select="addQuery"
                ></search-list>
              </div>
            </scroll>
          </div>
        </div>
        <div class="search-result" v-show="query">
          <suggest
            :query="query"
            :showSinger="false"
            @select-song="selectSongBySuggest"
          ></suggest>
        </div>
        <message ref="messageRef">
          <div class="message-title">
            <i class="icon-ok"></i>
            <span class="text">1首歌曲已经添加到播放列表</span>
          </div>
        </message>
      </div>
    </transition>
  </teleport>
</template>

<script>
import { computed, nextTick, ref, watch } from 'vue'
import { useStore } from 'vuex'
import searchInput from '@/components/search/search-input'
import Suggest from '@/components/search/suggest'
import Switches from '@/components/base/switches/switches'
import Scroll from '@/components/base/scroll/scroll'
import SongList from '@/components/base/song-list/song-list.vue'
import SearchList from '@/components/base/search-list/search-list.vue'
import Message from '@/components/base/message/message'
import useSearchHistory from '@/components/search/use-search-history'

export default {
  name: 'add-song',
  components: { searchInput, Suggest, Switches, Scroll, SongList, SearchList, Message },
  setup() {
      const visible = ref(false)
      const query = ref(null)
      const currentIndex = ref(0)
      const scrollRef = ref(null)
      const messageRef = ref(null)

      const store = useStore()
      const searchHistory = computed(() => store.state.searchHistory)
      const playHistory = computed(() => store.state.playHistory)

      const { saveSearch } = useSearchHistory()

      watch(query, async () => {
        await nextTick()
        refreshScroll()
      })

      async function show() {
        visible.value = true
        await nextTick()
        refreshScroll()
      }

      function hide() {
          visible.value = false
      }

      function refreshScroll() {
        scrollRef.value.scroll.refresh()
      }
      function addQuery(s) {
        query.value = s
      }
      function selectSongBySongList({ song }) {
        addSong(song)
      }
      function addSong(song) {
        store.dispatch('addSong', song)
        showMessage()
      }
      function selectSongBySuggest(song) {
        addSong(song)
        saveSearch(query.value)
      }
      function showMessage() {
        messageRef.value.show()
      }

      return {
          scrollRef,
          messageRef,
          visible,
          query,
          currentIndex,
          searchHistory,
          playHistory,
          show,
          hide,
          addQuery,
          selectSongBySongList,
          selectSongBySuggest,
          showMessage
      }
  }

}
</script>

<style lang="scss" scoped>
.add-song {
  position: fixed;
  top: 0;
  bottom: 0;
  width: 100%;
  z-index: 300;
  background: $color-background;
  .header {
    position: relative;
    height: 44px;
    text-align: center;
    .title {
      line-height: 44px;
      font-size: $font-size-large;
      color: $color-text;
    }
    .close {
      position: absolute;
      top: 0;
      right: 8px;
      .icon-close {
        display: block;
        padding: 12px;
        font-size: 20px;
        color: $color-theme;
      }
    }
  }
  .search-input-wrapper {
    margin: 20px;
  }
  .list-wrapper {
    position: absolute;
    top: 165px;
    bottom: 0;
    width: 100%;
    .list-scroll {
      height: 100%;
      overflow: hidden;
      .list-inner {
        padding: 20px 30px;
      }
    }
  }
  .search-result {
    position: fixed;
    top: 124px;
    bottom: 0;
    width: 100%;
  }
}

.message-title {
  text-align: center;
  padding: 18px 0;
  font-size: 0;
  .icon-ok {
    font-size: $font-size-medium;
    color: $color-theme;
    margin-right: 4px;
  }
  .text {
    font-size: $font-size-medium;
    color: $color-text;
  }
}
</style>
